Two-cycle explosive-motor.



A. F. PIEPER.

TWO-CYCLE EXPLOSIVE MOTOR. APPLICATION FILED APR. 25. 191 2.

1,199,204. PatefitpdSept. '26, 1916.

Z'SHEETS-SHEET I.

A. F. PIEPER.

TWO-CYCLE EXPLOSIVE MOTOR.

APPLICATION man APR. 25. m2.

Patented Sept. 26, 1916.

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vwamtoz lm bums Z l UNITED STATES PATENT OFFICE,

.ALZPHONSE F. PIEPER, OF ROCHESTER, NEW YORK. 3

TWO-CYCLE EXPLOSIVE=MOTOR.

To all whom it may concern:

Be it known'that I, ALPHONSE F. PmPER, of Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Two-Cycle Explosive Motors; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, and to the refer ence-numerals marked thereon.

My present invention relates to gas or hydrocarbon engines or motors, and it has for its object to provide certain improvements in the construction of two cycle multicylinder engines, whereby a more complete scavaging of the exhaust gases occurs from each of the several cylinders than has heretofore' been attained.

My invention also comprehends an arrangement of auxiliary ports, and passages connecting the auxiliary port of one cylinder with the main exhaust or outlet leading from another cylinder, to the end that the more powerful blast of gases exhausting from each cylinder may, during their outrush be employed to create a partial vacuum in another cylinder to complete scavaging of the gases therefrom and assist in supplying to said last mentioned cylinder a fresh charge of fuel. To these and other ends the invention consists in certain improvements and combinations of parts all as will be hereinafter more fully described, the novel features being pointed out in the claims at the end of the specification.

In the drawings: Figure 1 is a side elevation of an engine constructed in accordance with my invention; Fig. 2 is a top plan view thereof; .Fig. 3 is a view similar to Fig. 1, the exhaust manifold and the auxiliary eduction tube removed; Fig. 4 is a vertical sectional view taken on the line 47-4: of Fig. 2; Fig. 5 is a similar viewtaken on the line 5-5 of Fig. 2-; Fig. 6 is a detail sectional view showing the operation of the valves controlling the auxiliary exhaust passage, and Fig. 7 is a vertical sectional view taken on the line 77 of Fig. 5.

Similar reference numerals in the several figures indicate the same parts.

In illustrating my present invention, I have shown it applied to or incorporated in the structure ofa four cylinder two cycle .motor, in which the carbureted mixture is Specification of Letters Patent.

Patented Sept. 26, 1916.

- Application filed April 25, 1912. Serial No. 693,063.

introducedinto the crank cases of the several cylinders, from which it passes, under pressure, into said cylinders when theirrespective pistons are retracted. A

In carrylng out my invention, I provide each-of the several cylinders of the motor with an auxiliary exhaust passage which is opened by a valve after .the piston has started to travel into the cylinder and has closed the main exhaust passage. This auxiliary exhaust passage of each cylinder is connected by a suitable passage with an-as:

pirating nozzle which is so positioned'in respect to the main exhaust port of another cylinder of the engine that the outrush of the burnt gases, occurringwhen said port is opened will create a suction or partial vacuum in the passage connecting said auxiliary and main ports. The result of this unbalanced pressure occurring momentarily in the auxiliary exhaust passage, at the time the valve therein is opened will cause any spent gas lingering in the cylinder, to be sucked out, so that the entire cylinder chamber may be filled with the fresh carbureted mixture in readiness for a subsequent explosion. I

In the drawings I have shown the motor composed of the four cylinders A, B, C, and D provided, as shown in dotted lines, with pistons A, B, C and D, connected to the cranks of the crank shaft revolving in the crank cases A B", C and D of the res ective cylinders. These crank cases, as wi 1 be understood, are connected to the inlet mani fold 1 supplied with the explosive mixture drawn from the carbureter 2, or some other suitable source of supply. Each cylinder is provided with a compression chamber passage A, B ,'C and D connecting them with their respective crank chambers, whereby the carbureted mixture is, at the proper time, introduced into said cylinders. A detail of the arrangement of these passages is shown in Fig. 4, where it will be seen the chamber A receives the explosive mixture from the crank case through the passage 3, which is controlled by the check valve 4, and conducts it to the inlet passage 5, controlled by a puppet valve 6. The inlet passage 5 of each cylinder leads into one side thereof, and the several puppet .Valves 6 are actuated at proper times by the push rods A, B, C and D themovement of which is controlled by properly shaped cams I QL Dted on the cam shaft 7, which is haust apertures.

rotated in timedrelation to the crank shaft, communication between said shafts being preferably effected by a pair of gear wheels 8.

The main exhaust passages of the several. cylinders are best shown in Fig. 3 where they are indicated by A B C D each leading out of the side of the cylinder at such points that they are uncovered when forming a chamber 11 surrounding the wall 12, the interior dimensions of which define the area of the main exhaust passage. The wall 12 is provided with a plurality of perforations 13, inclined outwardly and so arranged that the speed of the. gases passing their inner ends will induce an outward movement of gas from the surrounding chamber 11 and the passage leading therefrom, One side of the casing 10 extends laterally, as indicated by 14, forming an elbow as shown in Fig. 5.

The auxiliary exhaust passages, indicated by A, 13 ,0 and D open laterally from their respective cylinders above the main exhaust ports, and each of them is provided with a puppet valve 15, as shown in Fig. 6, the respective puppet valves being operated by stems A 3 C D controlled by cams also arranged on the shaft 7, said cams being so formed that the respective auxiliary exhaust valves will be opened after the corresponding main exhaust port of each cylinder has been closed by the movement of the piston inwardly into its cylinder. The auxiliary exhaust ports open into the valve casings 16 containing seats for the valves 15, and preferably comprising the outwardly turned elbows 17 Q In the motor shown in the illustration the cranks on the crank shaft are set quartering or at angles of ninety degrees, and the timing mechanism for firing the charges in the respective cylinders is arranged, as will be understood to cause the explosions to occur first in the cylinder A, second in cylinder C, third in cylinder B and fourth in cylinder D. For this reason the auxiliary exhaust port of cylinder A is connected by the pipe a with the aspirator nozzle of cylinder G; th auxiliary exhaust port of cylinder C is connected by the pipe 0 with the aspirator nozzle of the cylinder B; the auxil- 'iary passage of cylinder B is connected by the pipe 7) with the aspirator nozzle of cylin- The exhaust der D; and the auxiliary exhaust passage of pendent upon the inrush of the fresh car bureted mixture, that portions of the burnt gases linger in corners or pockets of the cylinders to befoul the fresh mixture When this is placed under compression by the return stroke of the piston.

In the arrangement of the parts I have disclosed, it will be observed that I control the entrance of the fresh supply of gas to each cylinder by a valve which is not opened until a partial vacuum has been created in the cylinder unless the suction tending to produce the vacuum is great enough to draw the carbureted mixture through the valve seats 3 and 6. By delaying the opening of the inlet valve, the required quantity of the explosive mixture for a charge may be compressed into the chambers A B C D in proximity to the inlets and then permitted to rush into the cylinder in advance of the piston which is then moving in the direction to create compression. This obviates the loss of any fresh gases during scavenging as well as the weakening of the fresh charge by its admixture with the remnants of the previously burnt gases.

In carrying out my inventionthe tubular connecting passages may be concealed in the cylinder castings, or otherwise disposed, and I do not, therefore, intend to limit myself by the term tubular connection to the precise arrangement of the parts shown.

I claim as 'my invention:

1. In an explosive motor, the combination with a plurality of cylinders each provided with a main and an auxiliary exhaust port, of a tubular connection leading from the auxiliary port of one cylinder to the main exhaust port of another cylinder, and means interposed therein in such relation to the main exhaust port that the exhaust gases issuing therefrom will induce a suction at the auxiliary'port of said other cylinder.

2. In an explosive motor, the combination with a plurality of cylinders each provided with a main and an auxiliar exhaust port, of separate tubular connections each leading from each of said auxiliary ports to the main exhaust port of another cylinder and means in said tubular connections influenced by the outrush of gases from said main exhaust ports to create suction in said tubular connections.

3. In an explosive motor, the combinationwith a plurality of cylinders each provided with a main and an auxiliary exhaust port, and aspirator nozzles receiving the exhaust gases from the main exhaust ports, of a tubular connection associated with each of saidnozzles and each leading from the auxiliary exhaust port of another cylinder.

4. In an explosivemotor, the combination with four cylinders having the usual pistons therein, the crank shaft having its cranks connected to the several pistons and set quartering, said cylinders each having a main exhaust port and an auxiliary exhaust port, of a tubular connection leading from the auxiliary port of each cylinder to the "main exhaust port of another cylinder, and

means influenced by the outrush of gases from the main ports for inducing a suction in said tubular connections, said tubular connections being disposed between the cylinder ports in such order that the main exhaust occurring from any one cylinder will produce a suction at the auxiliary port of another cylinder from which the gases have been previously exhausted and in which the piston is returning in the direction of compression. t 1

5. In an explosive motor, the combination with a plurality of cylinders having the usual pistons land crank shaft connected thereto, said cylinders each having a main exhaust port opened and closed by the piston therein and also provided with an auxiliary exhaust port adapted to remain open momentarily when the main exhaust port is closed, of a tubular, connection leading from the auxiliary .port of each cylinder to the main exhaust port of another cylinder and means adapted to be operated by the ex haust gases issuing from the main ports for creating suction in said tubular connections, said connections extending between such cylinders that at the time the main exhaust port of one cylinder is uncovered the .main

exhaust port of the connected cylinder is closed by the return stroke of its piston moving in the direction of compression.

6. In a two cycle gas engine, the combination with a plurality of cylinders having main exhaust ports opened and closed by' the outward and inward movement of the pistons and provided with auxiliary ports adapted to remain open after the main ports have been closed by the inward movement of the respective pistons, of a tubular connection extending from the auxiliary port of each cylinder to the main port of another cylinder, said cylinders in the order of firing being such, that their respectivepistons are movlng in opposite directions at the time of exhausting from their main and auxiliary ports respectively, and means acted upon by i the outrush of gases from the main ports for inducing a suction inthe tubular connections.

7. The combination with a plurality bf gas engine cylinders each having main and auxiliary exhaust ports, and means for con trolling them whereby the auxiliary port of each. cylinder will remain open momentarily.

'8. In a two cycle motor, the combination with a connected cylinder and crank case, a piston head in the cylinder, a chamber of dimensions suitable for holding a firing charge of 'gas for the cylinder having a valve controlled passage through which gas .is received'under pressure from the crank case and retained and an outlet opening into the cylinder, of a valve controlling the outlet, means for creating a partial vacuum'in the cylinder, independently of the movement of the piston head and timing mechanism for opening said valve and ermitting the charge in said chamber to be rawn into ALPI-IONSE F. PIEPER.

Witnesses. a

G. WILLARD Rrorr, RUssELL B. GRIFFITH.

the cylinder. 

